What is GHSA-gqx7-99jw-6fpr?

GHSA-gqx7-99jw-6fpr is a security advisory published by GitHub Security Advisories with Medium severity. LibreNMS affected by reflected xss via email field

Which CVE IDs does GHSA-gqx7-99jw-6fpr cover?

GHSA-gqx7-99jw-6fpr covers the following CVE IDs: CVE-2026-26987. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-gqx7-99jw-6fpr?

GHSA-gqx7-99jw-6fpr affects 1 product, including: composer/librenms/librenms:\u003c 26.2.0.

GHSA-gqx7-99jw-6fprMedium

LibreNMS affected by reflected xss via email field

Vendor

GitHub Security Advisories

Published

February 18, 2026

Last Modified

February 20, 2026

🔗 CVE IDs covered (1)

CVE-2026-26987 →

📋 Description

Summary

reflected xss via email field

Details

visit http://127.0.0.1/settings/alerting/email
in the email address input but this payload <img src=1 onerror=alert(document.cookie)>
notice the alert

PoC

video attached with the report https://github.com/user-attachments/assets/c1b443f5-85c6-4545-b04f-def06d82b42e

Impact

can lead to ATO

🎯 Affected products1

composer/librenms/librenms:< 26.2.0

🔗 References (6)

https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr
https://github.com/librenms/librenms/pull/19038
https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b
https://github.com/librenms/librenms/releases/tag/26.2.0
https://nvd.nist.gov/vuln/detail/CVE-2026-26987
https://github.com/advisories/GHSA-gqx7-99jw-6fpr